furnace/papers/doc/7-systems/nes.md

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2022-01-16 06:10:43 +00:00
# NES
the console from Nintendo that plays Super Mario Bros. and helped revive the agonizing video game market in the US during mid-80s.
also known as Famicom.
# effects
- `12xx`: set duty cycle or noise mode of channel.
- may be 0-3 for the pulse channels and 0-1 for the noise channel.
2022-02-01 23:28:48 +00:00
- `13xy`: setup sweep up.
- `x` is the time.
- `y` is the shift.
- set to 0 to disable it.
- `14xy`: setup sweep down.
- `x` is the time.
- `y` is the shift.
- set to 0 to disable it.